NO.PZ2019012201000035
问题如下:
Initially, Fund ABC held active positions in two real estate stocks—one was overweight by 1 %, and the other was underweight by 1%. Fund ABC traded back to benchmark weights on those two stocks. Then, ABC selected two different stocks that were held at benchmark weights, one automobile stock and one technology stock. ABC over-weighted the automobile stock by 1% and underweighted the technology stock by 1%. What was the effect of ABC’s two trades on its active risk? ABC’s active risk:
选项:
A. decreased.
B. remained unchanged.
C. increased.
解释:
C is correct.
考点:Active Share and Active Risk
解析:主动风险受股票之间相关性的影响。不同行业的两只股票的相关性低于同一行业两只股票的相关性。因此,新头寸(汽车/科技股)的相关性低于初始头寸(房地产/房地产)的相关性。两只股票的相关性较低,两只股票头寸对主动风险的贡献就越大。
老师,我理解这四只股票在benchmark和portforlio里都有,也就是说B和P的差异只在于股票的权重不同,那active risk和所选这两只股票的相关性大小有什么关系呢? 李老师举的例子里万科/金地,万科/云南白药是分属于B和P的,他们的相关性会影响到B和P收益率的相关性,跟这道题是不一样的。 所以我觉得这道题应该选unchanged. 麻烦老师解惑